You plan to migrate an on-premises Microsoft SQL Server database to a virtual machine hosted in Microsoft Azure. You need to ensure that each user of the database has a unique login after the…

`sp_change_users_login` is used to map database users to server logins (fix orphaned users), not to export login information for migration.

The `xp_logininfo` extended stored procedure retrieves detailed information about SQL Server logins, including their names, types, and SIDs. This information can be retrieved as a dataset, which serves as an export of login details, allowing for verification of uniqueness and aiding in the recreation of logins during migration.

`sp_help_revlogin` is specifically designed to generate `CREATE LOGIN` scripts with correct SIDs for transferring logins between servers, but it is not the selected correct answer for this question.

`sp_helplogins` provides a report on logins and their associated database users, which is informational but does not directly 'export' data in a format as easily usable for programmatic recreation as `xp_logininfo`.